2 files changed, 24 insertions, 0 deletions

diff --git a/apps/plugin.c b/apps/plugin.c
index 670770dfc6..e0766e47bf 100644
--- a/apps/plugin.c
+++ b/apps/plugin.c
@@ -809,6 +809,7 @@ static const struct plugin_api rockbox_api = {
     onplay_show_playlist_menu,
     queue_remove_from_head,
     core_set_keyremap,
+    plugin_reserve_buffer,
 };
 
 static int plugin_buffer_handle;
@@ -963,6 +964,27 @@ int plugin_load(const char* plugin, const void* parameter)
     return rc;
 }
 
+/* For Terminate Stay Resident plugins
+ * Locks buffer_size bytes of the plugin buffer
+ * freed on plugin exit; call plugin_get_buffer first then reserve all
+ * or a portion with plugin_reserve_buffer()
+ * Returns size of buffer remaining */
+size_t plugin_reserve_buffer(size_t buffer_size)
+{
+    size_t locked_size = 0;
+
+    if (current_plugin_handle)
+    {
+        locked_size = ALIGN_UP(plugin_size + buffer_size, 0x8);
+        if (locked_size > PLUGIN_BUFFER_SIZE)
+            locked_size = PLUGIN_BUFFER_SIZE;
+
+        plugin_size = locked_size;
+    }
+
+    return (PLUGIN_BUFFER_SIZE - locked_size);
+}
+
 /* Returns a pointer to the portion of the plugin buffer that is not already
    being used.  If no plugin is loaded, returns the entire plugin buffer */
 void* plugin_get_buffer(size_t *buffer_size)
diff --git a/apps/plugin.h b/apps/plugin.h
index de1077c9b4..2e0ace2e48 100644
--- a/apps/plugin.h
+++ b/apps/plugin.h
@@ -49,6 +49,7 @@
 
 char* strncpy(char *, const char *, size_t);
 void* plugin_get_buffer(size_t *buffer_size);
+size_t plugin_reserve_buffer(size_t buffer_size);
 int plugin_open(const char *plugin, const char *parameter);
 
 #ifndef __PCTOOL__
@@ -935,6 +936,7 @@ struct plugin_api {
     void (*onplay_show_playlist_menu)(const char* path, void (*playlist_insert_cb));
     void (*queue_remove_from_head)(struct event_queue *q, long id);
     int (*core_set_keyremap)(struct button_mapping* core_keymap, int count);
+    size_t (*plugin_reserve_buffer)(size_t buffer_size);
 };
 
 /* plugin header */